We are not going to see a multiple upgrade until a larger portion of earnings come from the non-refining businesses. Refining PE's are low because of the roller coaster nature of earnings in this business. It will take a while for the MLP to be set up and some units sold via an initial public offering. Then the proceeds need to be invested in midstream and chemicals. As those businesses ramp up then the multiple will rise.
This is not a get rich quick stock. If you want that go buy a tech stock. a 3D printer stock or roll the dice on a low price oil shale play.